Total number of soil orders

Bray No 1 reagent used for estimation of

First manufactured fertilizer in India is

Most acid forming fertilizer is (M. Imp)

Dominant soil order in world is

Dominant metallic element in earth crust is

Swamp gas or Marsh gas is

Flocculating agent is

Study of soil from stand point of higher plants is known as

Dominant mineral in forest soils

Root developer is

Salt tolerant mechanism in barley is (M. Imp)

Most hygroscopic fertilizer is (ARS 2014)

Unique element is

Dominant primary mineral in earth crust is (ARS 2014)

Recently formed soil order is

Which of the following element is responsible for Eutrophication (2018 JRF)